• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The invention relates to a method for charging or discharging a capacitive element, preferably a piezoelectric crystal. The invention also relates to a single device which performs the charging of a capacitively elementally named method. The device consists of a bipolar buck-boost converter, which means that a capacitive element can be charged to both positive and negative voltages. Discharge of the capacitive element takes place with energy recovery and feedback to the device's power supply. To be published with Fig. 1
    公开号:SE1050485A1
    申请号:SE1050485
    申请日:2010-05-17
    公开日:2011-11-18
    发明作者:Goeran Cewers
    申请人:Mindray Medical Sweden Ab；
    IPC主号:
    专利说明:

    That actuators with considerably faster response time and considerably lower energy consumption can be manufactured. However, the use of this technology leads to other technical challenges.
    One of these is the electrical control of the piezo actuators.
    Piezo actuators need voltages up to 1000V to be fully controlled. With modern ceramic multilayer technology, however, it has been possible to reduce these voltages to the order of 100V, a significant reduction, but still a high voltage to handle, especially from today's used electronic systems that normally work with significantly lower voltages. It can also pose a risk to the user of high voltage devices, especially in medical applications.
    A piezoelectric actuator is very similar in construction to a ceramic multilayer capacitor, and the combination of a relatively large capacitance and high voltages means that significant energy can be stored in these actuators. The advantage of this stored energy is that the position of the actuator is maintained if the electrical connection is broken, meaning that no energy is needed to maintain the position. The disadvantage, however, is that stored energy must be taken care of if the actuator is to be controlled to a smaller range. In linear control applications, this means that a large part of this energy is lost to heat generation. Another problem is that the piezoceramic structure is encumbered with intrinsic friction, meaning that piezo actuators are encumbered with a mechanical hysteresis of the order of 20%. In order not to lose movement, you can therefore control the actuator with a negative voltage in the order of 20% of the normal positive control voltage. Negative voltages greater than 20% of the maximum permissible positive voltage should not be directed to the actuator, as it can then be destroyed.
    One way to get rid of many of the mentioned problems is to use switched technology in combination with an inductor. can then be switched back to the actuator.
    The stored energy in the power supply unit 10 15 20 25 30 35 i.a. In which the switching takes place with a simple A number of such solutions are described, patent US 6,6l7,754, inductor elements against a high voltage source with a central socket.
    The disadvantage of such a solution, however, is that the device needs a double high voltage source with voltages of the order of 100V or more.
    The objects of the invention are to provide a switched, energy recovery control of a capacitive element without using a high voltage source.
    Summary of the invention These objects are achieved by means of the device according to the appended independent claims, wherein particular embodiments are dealt with in the dependent claims.
    The present invention thus seeks in particular to counteract, improve or eliminate one or more of the above-identified shortcomings and disadvantages in conventional technology, individually or in any combination, and at least partially solves the above-mentioned problems by providing an equipment according to the appended claims.
    This is achieved by allowing the capacitive element to serve as a capacitor in the output stage of a boost controller. By adding extra switch functions and using an inductor with more windings, the boost controller can be combined with a buck regulator to be able to discharge the capacitive element with energy recovery. Embodiments include a method of charging or discharging a capacitive element, preferably a piezoelectric crystal. A device performs the charging of a capacitive element according to this method. According to embodiments, the device consists of a bipolar buck-boost converter, meaning that a capacitive element can be charged to both positive and negative voltages. Discharging of the capacitive element takes place with the said energy recovery and feedback to the power supply of the device according to certain embodiments.
    According to a first aspect of the invention, there is provided a drive circuit which is configured to control a capacitive element. The drive circuit in combination comprises a switched boost regulator circuit and a switched buck regulator circuit, as well as a plurality of switches.
    The drive circuit has two operating modes which are selectable by said switches, one operating mode being a boost controller and the other operating mode being a buck controller.
    According to embodiments, said switches comprise at least four switches, of which a first primary switch S1 and a second primary switch S2 are arranged on a primary side and a first secondary switch S3 and a second secondary switch S4 are arranged on a secondary side.
    The drive circuit comprises in certain embodiments at least one inductor which on the primary side preferably has at least two at least two windings L1 and L2.
    The operative layers can be obtained as follows: by opening the second primary switch S2 and the first secondary switch S3 and closing the second secondary switch S4 whereby a positive boost converter is obtained which is controlled by the first primary switch S1 for positive charging of the capacitive element X; by opening the first primary switch S1 and the second secondary switch S4 and closing the first secondary switch S3, a negative boost converter is obtained, which is controlled by the second primary switch S2 for negatively charging the capacitive element X; by opening the first primary switch S1 and the second primary switch S2 and closing the second secondary switch S4, a positive buck converter is obtained, which is controlled by the first secondary switch S3 for discharging the capacitive element X and feeding back to a tank capacitor C. In another embodiment, the capacitive element S4 is located on one side of the secondary winding L3 of the inductor; X grounded on one side; both secondary switches S3, and a diode D2 is located between the second primary switch S2 and the primary winding L2 of the inductor.
    By adding an extra diode D2, clamping effects are avoided in the event of a negative boost, which means that high negative voltages can be generated.
    The circuit is designed to drive capacitive preferably an element, such as an actuator element, piezo actuator. The circuit is designed so that a Boost controller is combined with a Buck controller by using an inductance / coil with more windings on the primary side and extra switches. Through this design, the drive circuit can control the capacitive element by either charging it with either positive and negative voltages by switching the circuit to either a positive boost converter and a negative boost converter, respectively.
    The capacitive element can also be discharged by switching the circuit to a positive Buck converter, which means that the discharge takes place with energy recovery and feedback to the device's power supply. This means that the energy accumulated in the actuator that is otherwise lost to heat generation when an actuator is to be controlled to a smaller stroke is not lost.
    Via this construction of the drive circuit, the negative control range of the actuator is also limited.
    This means that when the drive circuit is used to control the actuator with a negative voltage, in order not to lose movement due to mechanical hysteresis, it is not possible to control the circuit with such large negative voltages that the actuator is destroyed. This limit of what an actuator can handle is in the order of 20% of the maximum permissible positive voltage.
    The switches preferably consist of MOS transistors but are not limited to this. In a second aspect, the invention comprises a method of driving and controlling capacitive elements.
    The method comprises providing a combined switched boost regulator circuit and a switched buck regulator circuit, as well as a plurality of switches, and providing has two selectable operating modes by controlling said switches, one operating mode being a boost controller and the other operating mode being a buck regulator.
    In embodiments, the boost controller is used to charge the capacitive element with both positive and negative voltages, such as an actuator element, preferably a piezo actuator, and the buck regulator is used to discharge the capacitive element through energy recovery and feedback to the power supply of the drive circuit.
    In some embodiments, a negative control range to the actuator is limited, such as on the order of 20% of the maximum allowable positive voltage.
    The advantages of this method are as for the equipment described above. That a capacitive element, eg an actuator element, preferably a piezo actuator, can be operated with both positive and negative voltage and discharged where the energy accumulated in the actuator is not lost such as heat, but can be recovered by feeding back to the device's power supply. General Description of the Drawings These and other aspects, features and advantages of the invention at least in part are made more apparent and specified by the following description of embodiments of the present invention, taken in conjunction with the accompanying figures, in which: electrical connection; Figure 2 shows in a schematic view an equivalent to the electrical connection according to Figure 1, connected as a positive boost converter; Figure 3 shows in a schematic view an equivalent to the electrical connection according to Figure 1, connected as a negative boost converter; Figure 4 shows in a schematic view an equivalent to the electrical coupling according to Figure 1, connected as a positive buck converter; and Figure 5 shows in a schematic view a further embodiment of an electrical connection.
    Description of embodiments Figure 1 shows in a schematic view an embodiment of an electrical connection.
    The inductor has a winding ratio N1 and N2 on the primary side, and N3 on the secondary side.
    Figure 2 shows in a schematic view an equivalent to the electrical connection according to figure 1 when S2 and S3 are open and S4 is closed. In this configuration, the clutch acts as a positive boost converter. Energy is switched using Sl from Vcc and the tank capacitor C.
    Figure 3 shows in a schematic view an equivalent to the electrical connection according to figure 1 when S1 and S4 are open and S3 is closed. In this configuration, the clutch acts as a negative boost converter. Energy is switched by means of S2 from Vcc and the tank capacitor C. The diode DI together with the winding ratio of the inductor limits the controllable negative voltage to the capacitive element to a desired fraction of Vcc.
    Figure 4 shows in a schematic view an equivalent to the electrical connection according to Figure 1 when S1 and S2 are open and S4 is closed. In this configuration, the clutch acts as a positive buck converter. Energy is switched by means of S3 from the capacitive element X to the tank capacitor C. Figure 5 shows in a schematic view another embodiment of an electrical connection according to a principle of the invention. In this embodiment, the capacitive element X is grounded on one side, and the switches S3 and S4 are placed on one side of the secondary winding L3 of the inductor. In addition, a diode D2 is supplied. D2 prevents the previously mentioned clamping effect at negative boost, which means that high negative voltages can be generated when D2 is involved in the clutch.
    In said coupling example, no couplings are included for dealing with transients caused by inductance common in the inductor between cooperating windings.
    However, this is a known technique, which is why it is not shown here.
    Description of positive boost This process is active when a voltage Vcc is to be converted from a limited negative voltage to a large positive voltage across the crystal X. S2 and S3 are open, and S4 is closed in this state. The functional parts of the circuit in this state are described in Figure 2. Figure 2 shows in a schematic view this equivalent to the electrical connection according to Figure 1 when S2 and S3 are open and S4 is closed. 1. When S1 is closed, the current is ramped up in L1. The field in the core of the transformer is built up to a positive field value. The voltage to the diode D4 during this time becomes Vcc * N3 / N1 and no current flows through D4 or X. 2. S1 is opened and the field in the core of the transformer drops to zero. The voltage across D4 drops immediately until it starts to conduct, about -O.6V and L3 and X so that the voltage across X in a number of cycles successively a current flows through D4, ramped up to a large voltage of for example 120V. at each cycle, the voltage across D1 will rise above Vcc and no current will flow through L1. 3. S1 closes again, etc. 10 15 20 25 30 35 Description of negative boost This process is active when a voltage Vcc is to be converted from zero to a limited negative voltage across the crystal X. S1 and S4 are open, and S3 is closed in this state. The functional parts of the circuit in this state are described in Figure 3. Figure 3 shows in a schematic view this equivalent to the electrical connection according to Figure 1 when S1 and S4 are open and S3 is closed. l. When S2 is closed, the current is ramped up in L2. The field in the core of the transformer is built up to a negative field value. The voltage against the diode D1 becomes Vcc during this time and no current flows through D1. The voltage towards the diode D5 also becomes positive and no current flows through L3, D5 or X. 2. S2 is opened and the field in the core of the transformer rises towards zero. then; A boost via L3 generates a negative voltage across Two competing processes prevails X, or a boost over L1 which ramps up the energy stored in the transformer back to C and the supply voltage Vcc. The boost process that is active is determined by the voltage across the capacitive element (piezo crystal) X, Vcc and the transformer's turnover number N3: Nl. In practice, this means that the negative boost is limited to -Vcc * N3 / Nl. If Vcc = 12V and N3: N1 are 5: 3, the maximum voltage across X -2OV will be. 3. S2 closes again, etc.
    Description of positive buck This process is active when the crystal X is to be emptied of its charge, ie. that the voltage goes towards zero.
    S4 is closed in this state.
    The functional parts of the circuit in this state described in S1 and S2 are open, Figure 4. Figure 4 shows in a schematic view this equivalent 10 to the electrical connection according to Figure 1 when S1 and S2 are open and S4 is closed. 1. When S3 is closed, the current from X is ramped up in L3.
    The field in the core of the transformer is built up to a negative field value. The voltage towards the diode D1 becomes positive during this time and no current flows through D1. In this phase, the crystal X is gradually emptied of its charge. 2. S3 opens and the field in the core 10 of the transformer falls towards zero. The voltage across D1 drops immediately until it starts to conduct, about -O.6V and a current flows through D1, L1 and C so that the energy from the crystal X is fed back to C and Vcc. 3. S3 closes again, etc. 15
    权利要求:
    Claims (1)
    [1]
    1. lO 15 20 25 30 35 ll PATENT CLAIMS Drive circuit configured to control a capacitive element (X), which in combination comprises a switched boost regulator circuit and a switched buck regulator circuit, and a plurality of switches, the drive circuit having two operative layers selectable by said switch, wherein one operative position is a boost controller and the other operative position is a buck controller. Drive circuit for controlling capacitive elements according to claim 1, wherein said switch comprises at least four switches, of which a first primary switch (S1) and a second primary switch (S2) are arranged on a primary side and a first secondary switch (S3) and a second secondary switch (S4). ) years arranged on a secondary year page; wherein the drive circuit comprises at least one inductor on the primary side having at least two windings (L1 and L2); and whereby the operative laws are obtained - by opening the second primary switch (S2) and the first secondary switch (S3) and closing the second secondary switch (S4) whereby a positive boost converter is obtained which is controlled by the first primary switch (S1) for positive charging. of the capacitive element (X); - by opening the first primary switch (S1) and the second secondary switch (S4) and closing the first secondary switch (S3), a negative boost converter is obtained, which is controlled by the second primary switch (S2) for negatively charging the capacitive element (X). ; - by opening the first primary switch (S1) and the second primary switch (S2) and closing the second secondary switch (S4), a positive buck converter is obtained, which is controlled by the first secondary switch (S3) for discharging it. 3. 10 Method for controlling a capacitive element 12 The capacitive element (X) and feedback to a tank capacitor (C). Drive circuit according to claim 2, wherein - the capacitive element (X) is grounded on one side; (S3, S4) side of the inductor's secondary winding - a diode (D2) the primary switch (S2) (L2). - both secondary switches are located on one (L3); and is located between the second and the primary winding of the inductor Drive circuit according to claim 1, which comprises an inductor with at least two windings as energy storage element for the drive circuit. Drive circuit according to any one of claims 1 to 4, wherein the drive circuit is configured to direct both positive and negative voltage to the capacitive element. Drive circuit according to claim 5, wherein a negative control range to the capacitive element is limited. Drive circuit according to claims 1 to 6, wherein the capacitive element is an actuator element. The drive circuit according to claim 7, wherein the actuator element consists of a piezoelectric actuator. Drive circuit according to claims 1-8, wherein at least one of the switches is constituted by a MOS transistor. (X), comprising providing a combined switched boost regulator circuit and a switched buckle regulator circuit, and a plurality of switches, and providing two selectable operating positions by controlling said switches, one operating position being a boost controller and the other operating mode is a buck controller. A method according to claim 10, wherein the boost regulator is used to charge the capacitive element with both positive and negative voltages, such as an actuator element, preferably a piezo actuator, and wherein the buck regulator is used to discharge the capacitive element by energy recovery and feedback to the power supply. A method according to claim 10 or 11, wherein a negative control range to the actuator is limited, such as in the order of 20% of the maximum permissible positive voltage.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    FR2829314B1|2001-09-04|2004-08-27|Renault|DEVICE FOR CONTROLLING A PIEZOELECTRIC ACTUATOR AND ITS IMPLEMENTING METHOD|
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    法律状态:
    优先权:
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    SE1050485A|SE536247C2|2010-05-17|2010-05-17|Drive circuit and method for controlling a capacitive element|SE1050485A| SE536247C2|2010-05-17|2010-05-17|Drive circuit and method for controlling a capacitive element|
    PCT/EP2011/057811| WO2011144542A2|2010-05-17|2011-05-15|Driver circuit and method for controlling a capacitive element|
    EP11721479A| EP2572444A2|2010-05-17|2011-05-15|Driver circuit and method for controlling a capacitive element|
    CN201110126200.8A| CN102255556B|2010-05-17|2011-05-16|Drive circuit and the method controlling capacity cell|
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